Follow the procedure linked below and post the screenshots here.
I need to know how you use all of data in my billing cycle in two days when service was not even being used. 30 Gb. Plan
Evidence will go a long way to help your case. Follow the procedure outlined here: https://community.hughesnet.com/t5/Tech-Support/Where-s-my-bytes-Testing-for-data-leaks/m-p/77194#M5...
Anyone who is experiencing data loss they can't explain should follow the linked procedure and post the screenshots.
I have, and still have the same problem. I have been unplugging unit when not in use.